William f



(No Model.)

8 W. P. BOYSEN.

PULLEY.

No. 281,828. Patented July 24, 1883.

n. PEYERS, Ph'olo-Lilhcirapm Washinglan. n. c

.UNITED STATES PATENT YVILLIAM F. BOYSEN, OF BUFFALO, NEW YORK.

PULLEY.

SPECIFICATION forming part of Letters Patent No. 281,828, dated July 24, 1883 Application filed January 10, 1883. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM F. BOYSEN, of the city of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Pulleys, of which the following is a specification.

This invention relates to an improvement in that class of pulleys which are provided on their periphery or face with a covering for the purpose of increasing the adhesion of the belt upon the pulley, and to prevent the slipping of the belt and the loss of power result ing therefrom. Heretofore wood, leather, rubber, and paper have been used for such covering; but none of these constructions are entirely satisfactory, as they all become hard and smoothin course of time and permit the belt to slip, as it would if no covering were applied to the pulleys. In addition to these disadvantages, wood cannot be readily applied to the pulley as a covering, andleather and rubber, when used for this purpose, becomehard and brittle under the pressure of the belt and crack. The object of my invention is the construction of a pulley having a covering which possesses considerable adhesiveness, and which will not become hard and smooth by use, and which is easily applied to the pulley.

My invention consists to that end of a pulley provided on its face or periphery with a represents a side elevation, and Fig. 2, a crosssection of my improved pulley. Fig. 3 is a perspective view of a portion of the rim of the pulley.

Like letters of reference refer to like parts in the several figures.

A represents the rim of the pulley, and B the covering of cork, which is applied to the face or rim by means of a suitable cement.

In applying the cork covering to the pulley I prefer to proceed in the following manner: The pulley is first heated to a temperature of 100 Fahrenheit, or thereabout, and the rim of the pulley is then covered with a co1nposition composed of white lead, boiled linseedoil, acetate of lead, and boraX. I select for the covering cork which is soft and elastic, the brittle kind not being desirable for this purpose. The cork is applied in strips or sheets having a thickness of about one-eighth of an inch; but any other thickness may be employed, if desired. The cork is coated on its inner side with a composition composed of white glue, milk, shellac, and Venetian turpentine. This composition is applied to the cork warm, and the rim of the pulley is also coated with the same composition in a warm state. The sheets or strips of cork are then applied to the face of the pulley and adhere thereto very firmly.

The transverse joints between the several strips of cork of which the covering is composed are beveled, as shown at c, and the bevels are so arranged with reference to the direction in which the pulley runs that the edge of the outer bevel forms the rear edge of the joint. By this construction of the joints an unbroken surface of the covering is insured and the rivets or other projection which. may exist on the belt are prevented from entering the joints and injuring the same.

The facing of the pulley may be turned off before the cork covering is applied thereto; or the covering may be applied to the pulley in its rough state as it comes from the sand; and the cork covering can. be trued off afterward by turning the pulley on a suitable spindle and applying a file or rasp to the cork covering.

The cork covering herein described does not become hard and smooth under the pressand adhesive condition under continued use,

and completely prevents the slipping of the belt upon the pulley, and thereby saves a large percentage of power which would otherwise be lost.

The covering is cheap and easily applied to the pulley, and if secured to the pulley by the cement, as hereinbefore described, the covering will not change or become loose underthe influence of heat, steam, and moisture, to which pulleys employed in machinery are frequently exposed.

I am aware that it is not new to construct the grain, whereby the cork coating is pre pulleys of disks of cork secured side by side served in its original state ofv efficiency. upon a hub which extends through the series I claim as my invention 7 15 of disks, and I do not claim such construc- The combination, witha pulley, of a facing 5 tion, which is essentially different from my or covering, B, composed of sheets or strips improvement, because in a pulley so 0011- of cork cemented to the rim or face of the pul strueted of disks the driving-belt will run ley, substantially as set forth.

more or less on the end of the grain on alarge T T l i I V I portion of the eork-surfaee, and thereby tend M F BOX SEN IO to crush or bruise the cork, while in my coat- Vitnesses:

ing, which is applied in sheets or strips, the hi0. J. BONNER,

belt runs on all parts of the cork surface with Time. L. Porr. 

